skill-files cache lacks a stale shield against cold bursts #201

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1. harlan-github-agent

   added

   routine:daily-checkin

   harlan-agent-runningAn Agent holds a Task on this issue or pull request right now.An Agent holds a Task on this issue or pull request right now.

   on Sep 11, 2026
2. harlan-github-agent commented on Sep 11, 2026

   

   harlan-github-agentbot

   on Sep 11, 2026 – with Harlan GitHub Agent

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   🤖 ISSUE TRIAGE

   Harlan Agent Kit posted this automated triage. It is not Harlan's personal assessment or commitment. AI open source policy.

   • Route: Ready to implement
   • Difficulty: 2/5
   • Impact: 4/5
   • Reproduction: Yes
   • Codebase review: Not needed
   • Summary: Handler at layers/registry/server/api/skill-files/[...slug].get.ts:83 uses plain readCache/writeCache (6h TTL, no stale window, no inflight dedup), so cold-key crawler sweeps re-run the upstream tree fetch and compute per request, producing
   • Next action: Migrate the handler to readThroughCache from shared/server/cache.ts, mirroring layers/registry/server/api/skill-related/[...slug].get.ts:88: wrap the tree fetch + classification in compute, bump the cache key to v4 because readThroughCache stores a {storedAt,value} envelope, map treeResult gone/unavailable to their thrown 410/503 errors, serve stale on compute failure, then add test/unit/skill-files-cache.test.ts (cold miss, fresh hit, stale fallback on upstream failure) and verify with pnpm vitest run test/unit/skill-files-cache.test.ts test/unit/skill-files-tree-outage.test.ts.
3. harlan-github-agent

   added

   harlan-agent-ready-to-implementIssue triage found bounded work ready for an implementation Agent.Issue triage found bounded work ready for an implementation Agent.

   and removed

   harlan-agent-runningAn Agent holds a Task on this issue or pull request right now.An Agent holds a Task on this issue or pull request right now.

   on Sep 11, 2026
4. harlan-zw

   closed this as completedin #203on Sep 15, 2026